Improvement in the construction of pulleys



UNITED STATES PATENT EEICE.

A. VVARTH, OF STAPLETON, NEW YORK.

Specilication forming part of Letters Patent No. 53,7] l, dated April 3, 1866.

To all whom t may concern:

Be it known that I, A. IVARTH, of Stapleton, in the county of Richmond and State of New York, have invented a new and useful Improvement in the Construction of Pulleys; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part ot' this specilicatioli, in which- Fignre l represents a transverse section of a grooved pulley constructed according to this invention. Fig. 2 is a side elevation of the same. Fig. 3 is a longitudinal central section of a tlat pulley constructed according to this invention. Fig. 4 is a side elevation of the same.

Similar letters of reference indicate like parts.

llhis invention consists in constructing' or forming the working face or faces of a pulley of one or more layers of india-rubber orother elastic material in combination with a protecting layer of leather, felt, or other liexible material, in such a manner that a friction-surface ,is obtained which eftectually prevents the belt from slipping; it consists, further, in the construction ot' a grooved-pulley, which is composed of three parts-viz., two disks with suitable recesses to receive the india-rubber or other elastic material, and united by a screw which serves to adjust the working-faces of the pulley, in combination with an intervening plate of metal or other rigid material, in such a manner that by meams ot' the regulatingserew the pulley can be adjusted for bolts ot' various diameter, and by theintervening plate the leather faces of the pulley are kept in p0- sition and the two disks are prevented. from being set too close.

A represents a grooved pulley, which is composed of two disks, a a', each of which is provided with an annular recess on its inner surface to receive the plates b of india-rubber or other soft and elastic material. The two disks a, a are united by a screw-thread, c, which allows of adjusting the same closer together or farther apart, according to the thickness of the bolt which is to be used on the pulley. rIhe india-rubber plates b are protected each by a layer, d, ot' leather, felt, or other liexible material, and these layers are held in place by a plate, c, of metal or other rigid material, which is titted between the two disks a a.

ln applying my invention to a fiat-faced pulley, Ait, I take a core, ai", of wood or metal, cover the same with a layer, bit, ot' indiarubber or other soft and elastic material, and this layer I finally cover by a `jacket, bit dit, of leather or other liexible material, as shown in Fig. 3, the leather being riveted to a metal thimble, ci", which is firmly secured to the core at. By these means grooved or flat-faced pulleys can be constructed which eftectually prevent a belt from slipping, or which enable a belt to draw tive or more times as much as pulleys of the ordinary construction, according to the tension applied to the belt.

rlhis statement can be substantiated by a simple trial with weights, as indicated in Figs. 2 and et, where the small weights represent the tension ot' the belts, and the large weights the power required to make the belt slip.

VVha-t I claim as new, and desire to secure by Letters Patent, is-

l. Constructing the working-face or faces ot' a pulley ot' one or more layers ot' indiarubber or other sot't and elastic material covered with leather cr other flexible material, substantially as and for the purpose described.

2. The combination and arrangement of the adjustable disks a a', india-rubber plates b, leather faces d, and intervening metal plate c, all constructed and operatin g substantially as and for the purpose described.

ALBlN WARTH.

Witnesses:

M. M. LIVINGSTON, ALEX. F. ROBERTS. 

